If it's factory sealed, yes. But there is a chance it's refurbished and they placed it back in a box to make it appear new... It depends where you buy it from but since you're buying in Europe, I don't know how shady stores can be...but that is for september is that guaranteed that version 9.2 for europe?
9.0-9.2 is the glory zone for cfw. But anything lower than 9.3 can get cfw, either through MSET, spider, or other means. It's recommended to go through the entire arm9loaderhax guide https://github.com/Plailect/Guide/wiki to install arm9loaderhax so you can keep your sysNAND updated, and run hacks the second you boot your 3DS. If you're uneasy about following it, just follow this guide to https://github.com/Plailect/Guide/wiki/Get-Started-(Old-3DS---EUR) to update/downgrade 9.2 and install menuhax for your DS.a thanks firmware 9.0 is good to get custom firmware?
No problem And if it's not on a firmware that you desire, just return it to the store and make up a story like "my nephew wanted a different color" or something like thatthanks than im going to buy a new console
You'll be very lucky if you find one on those FWs.
But, for installing CFW, as long as it's 10.5 or below, your safe and won't need anything except to block your NET connection with the Tubehax DNS as soon as you make your first start.
Check the guide to see what to do:
https://github.com/Plailect/Guide/wiki/Get-Started